The sales of Cain’s book come at the same time he is rising in the polls. A new ABC News/Washington Post national poll has Cain and Texas Gov. Rick Perry tied for second place with 16 percent each. Former Massachusetts Gov. Mitt Romney leads the pack with 25 percent.

In addition, a poll from the Democratic-leaning Public Policy Polling group has Cain leading in North Carolina, West Virginia and Nebraska.

Public Policy Polling pollster Tom Jensen tweeted, “In four years at PPP, I’ve never been as befuddled by a set of polls as this past weekend’s [polls].”

Cain’s rise in the polls began when he won a Florida straw poll Sept. 24. Cain received 37 percent, compared with 15 percent for Perry and 14 percent for Romney. Cain followed the win with a round of strong performances on the Sunday talk shows, where he hammered Perry for owning a hunting lodge on a parcel of land known as “N----rhead.”

This Is Herman Cain charts Cain’s journey from the segregated South of the '50s and '60s to his time at the elite all-black Morehouse College to the chief executive’s office at Godfather’s Pizza.

In addition to telling his life story, Cain presents his political views, arguing that if he could succeed, anyone can.

In an early review, the conservative commentator Roger Simon gave the book a positive nod and expressed affection for Cain: “The secret of Herman Cain is that he seems -- at least to me -- genuinely to be a mentally healthy human being."